Feng-Xia Liang, Lin Liang, Xing-Yuan Zhao, Xiao-Wei Tong, Ji-Gang Hu,* Yi Lin,Lin-Bao Luo,* Yu-Cheng Wu*

Abstract: we reported on the utilization of the mesoporous α-Fe2O3 films as optical sensors for detecting organic vapors. The mesoporous α-Fe2O3 thin films, which exhibited obvious Fabry-Perot interference fringes in the reflectance spectrum, were successfully fabricated through electrochemically anodization of Fe foils. Through monitoring the optical thickness of the interference fringes, three typical organic species with different vapor pressure and polarity (hexane, acetone and isopropanol) were applied as probes to evaluate the sensitivity of the α-Fe2O3 based interferometric sensor. The experiment results showed that the as-synthesized mesoporous α-Fe2O3 interferometer displayed high reversibility and stability for the three organic vapors, and were especially sensitive to isopropanol, with a detection limit of about 65 ppmv. Moreover, the photocatalytic properties of the α-Fe2O3 under visible light is beneficial for degradation of dodecane vapor residues in the nano-pores and refreshment of the sensor, demonstrating good self-cleaning properties of the α-Fe2O3-based interferometric sensor.